Spread state context architecture (Fixes #18) (#30)

Reviewed-on: #30
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/fighter/state/ground.rs

@@ -3,7 +3,7 @@
 //! bit-for-bit deterministic for rollback.
 
 use crate::fighter::state::{
-    FighterState, FighterStateContext, dash, ground_attack, turn, wait, walk,
+    CollisionContext, FighterState, InterruptContext, dash, ground_attack, turn, wait, walk,
 };
 use crate::fighter::{
     FighterAttributes, FighterPreviousTranslation, FighterTranslation, FighterVelocity,
@@ -164,13 +164,13 @@ pub fn apply_grounded_motion(
 }
 
 pub fn collide_with_stage_grounded(
-    state_context: &mut FighterStateContext,
+    state_context: &mut CollisionContext,
     ground_common: &mut GroundedStateCommon,
     can_walk_off: bool,
 ) -> GroundedMotionResult {
     let translation = &mut state_context.translation;
-    let ecb = &state_context.ecb;
-    let stage_collision = &state_context.stage_collision;
+    let ecb = state_context.ecb;
+    let stage_collision = state_context.stage_collision;
 
     let stage_poly = stage_collision
         .stage_polys
@@ -322,14 +322,14 @@ mod tests {
 }
 
 pub fn grounded_movement_common_interrupts(
-    state_context: &FighterStateContext,
+    state_context: &InterruptContext,
     ground_common: &GroundedStateCommon,
 ) -> Option<FighterState> {
     super::jump::check_input(state_context, ground_common)
 }
 
 pub fn grounded_movement_standstill_common_interrupts(
-    state_context: &FighterStateContext,
+    state_context: &InterruptContext,
     ground_common: &GroundedStateCommon,
 ) -> Option<FighterState> {
     if let Some(state) = ground_attack::check_interrupt(state_context, &ground_common) {